After realizing he had transmigrated into the world of Harry Potter...
The first thing Lancelot did was destroy the Harry Potter and the Philosopher's Stone he had written.
The second was to tell his old butler, "Kill every owl that comes to the manor!"
The third was to decide that no matter what, even with a knife at his throat, even with wands pointed at him in threat, even if owls overran his home, he absolutely, positively, definitely would not go to Hogwarts to study magic!!
And then...
Albus "Shameless" Dumbledore showed up.
This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Please do not imitate.